PowerTech Generator Basler Voltage Regulator

[davidbrady]

When I replaced my Basler voltage regulator for my Powertech generator I was surprised to see that the AVC63-4 actually senses 240VAC. My Vantare doesn't have any 240VAC loads. My generator is configured to supply two in-phase 120VAC feeds, but the same voltage regulator (the AVC63-4) works regardless of whether the unit is configured for 120VAC or 240VAC. For this to work, Powertech (or the folks who make the generator head) did something interesting. They added another 120VAC sense winding that's out of phase with line feeds. Here's a picture of how to hook up a 240VAC Basler AVC63-4 when running the generator as a 120VAC unit:



F+ and F- connect to the exciter windings. 3 and 4 sense the 240VAC voltage generated across E1/E4 through T1/T2. Individually each of these windings is 120V but together they provide a 240V sense to the regulator. Notice the jumper jumping T1 and T3 at the breaker. This connects both windings in parallel so each winding can power both legs and the generator is always perfectly balanced.

This same voltage regulator can regulate 240VAC by connecting it as shown in the below pic. Notice how the regulator's 3 terminal connects to T1 and 4 connects to T4. Between T1 and T4 the generator generates 240VAC. Pretty clever.